{"id":"AZL-80238","summary":"CVE-2026-30922 affecting package python-pyasn1 for versions less than 0.4.8-2","details":"pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.3, the `pyasn1` library is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing thousands of nested `SEQUENCE` (`0x30`) or `SET` (`0x31`) tags with \"Indefinite Length\" (`0x80`) markers. This forces the decoder to recursively call itself until the Python interpreter crashes with a `RecursionError` or consumes all available memory (OOM), crashing the host application. This is a distinct vulnerability from CVE-2026-23490 (which addressed integer overflows in OID decoding). The fix for CVE-2026-23490 (`MAX_OID_ARC_CONTINUATION_OCTETS`) does not mitigate this recursion issue. Version 0.6.3 fixes this specific issue.","modified":"2026-09-02T06:51:55Z","published":"2026-03-18T04:17:18Z","upstream":["CVE-2026-30922"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-30922"}],"affected":[{"package":{"name":"python-pyasn1","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/python-pyasn1"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.8-2"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-80238.json"}}],"schema_version":"1.9.0"}